The Vast, the Shift, the Spoken, the Balance, the Cycle, and the Deep. Six rival guilds of magic exist in our world, and unlike her identical twin, Charlotte, Kenna Gilmore doesn't want anything to do with them or their wars. That is, until Charlotte is suddenly declared dead, and all signs point to a member of her Guild, the Deep, being responsible. The police certainly can't help, so the only way to find the murderer is for Kenna to take Charlotte's place, masquerading as her to draw out the killer again. But with all six of the magical guilds on the brink of war and rumors of the mysterious seventh guild returning, infiltrating the guild of secrets and shadows is far more dangerous than Kenna could have ever imagined. In order to find the killer and make it out alive, Kenna must master Deep magic, navigate bloody guild politics, fool people who have known her sister for years, discover a mysterious power of her own, and maybe even decide the fate of a war.